package com.code.day19;

import java.util.Hashtable;

public class Demo08HashTable {
    public static void main(String[] args) {
        Hashtable<String,String> map = new Hashtable<>();
        map.put("1","1");
        map.put("2","2");
//        map.put(null,null);
        System.out.println(map);
    }
}
